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Khan Academy
Khan Academy: What Are Psychotic Disorders?
An overview of psychotic disorders including chemical imbalance and symptoms. A Quick Guide to Diagnostic Criteria of Schizophrenia and A Quick Guide to Diagnostic Criteria of Schizoaffective Disorder are part of this article.
Other
Collin College:general Psychology: Abnormal Behavior and Psychological Disorders
Explains the many different categories of abnormal behavior, and the subcategories in each group.